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Subject: Geographical Features

  • Singhbhum Craton: Insights from the Archaean Age

    Why in the News?

    • Some recent study about the Singhbhum Craton in India, reveals that explosive volcanic eruptions were frequent around 3.5 billion years ago in regions that are also present in South Africa, and Australia.

    What are Cratons?

    • Cratons are stable, ancient portions of the continental lithosphere, consisting of Earth’s two topmost layers—the crust and the uppermost mantle.
    • Cratons are typically found in the interiors of tectonic plates and are characterized by their ancient crystalline basement rock, often dating back to the Archean Eon.
    • Mantle plume events have played a significant role in the evolution of cratons.

    About Singhbhum Craton:

    • The Singhbhum Craton is a geological region in India.
    • Location: It is located in eastern India, covering parts of the states of Jharkhand, Odisha, and West Bengal. The craton is separated from the Bastar Craton by the Mahanadi Graben and is in the vicinity of two Proterozoic mobile belts: the Satpura Mobile Belt and the Eastern Ghat Mobile Belt.
    • Geological features:
      • The rocks in the Singhbhum Craton are predominantly of Archean age, ranging from Paleoarchean to Paleoproterozoic.
      • It is a part of the larger Indian Shield, which is a stable continental crust that formed during the Archean Eon.
      • The Singhbhum Craton is known for its abundant occurrences of Banded Iron Formations (BIFs), which are closely associated with basic volcanic and ultrabasic intrusive. The craton is also known for its iron ore deposits, which are found in the Iron Ore Group (IOG) and are closely associated with lavas and tuffs.
      • The Singhbhum Craton has undergone regional metamorphism of the amphibolite facies and is believed to have evolved as a consequence of multiple phases of compressive deformation.
      • The craton is made up of multiple pulses of discrete mantle plume events, resulting in a complex geological history.

    Archaean Eon

    • The Archaean Eon, one of the two formal divisions of Precambrian time, began about 4 billion years ago and extended to the start of the Proterozoic Eon.
    • During this period, life on Earth was limited to simple single-celled organisms lacking nuclei, known as Prokaryota.
    • The atmosphere lacked oxygen, and the Earth’s crust had cooled enough to allow the formation of continents.
    • Volcanic activity was considerably higher than today, with numerous lava eruptions.
    • The oldest rock formations exposed on Earth are from the Archaean Eon.
    • The Archaean rock system includes Archaean Gneisses and Schists, which are the oldest metamorphosed rocks found in abundance in regions like the Dharwar district of Karnataka.

    What are the recent key findings?

    • Submarine Mafic Volcanism: The prevalence of submarine mafic volcanic eruptions between 3.5 and 3.3 billion years ago is documented, enriching our understanding of ancient volcanic and sedimentary processes.
    • Geodynamic Insights: Comparative analysis enhances our comprehension of early Earth tectonic activities and surface/atmospheric processes during the Archaean.

    Research Methodology Used:

    • Field Studies and Radiometric Dating: Detailed field-based studies coupled with uranium-lead radiometric-age dating were employed to establish geological timelines and understand magma crystallization.
    • Comparative Analysis: The geological similarities between the Singhbhum Craton and counterparts in South Africa and Australia were studied, focusing on volcanic eruption patterns.

    Implications and Significance of the study:

    • Earth’s Formative Years: Insights into Earth’s early tectonic activities contribute significantly to understanding the planet’s formative years.
    • Habitable Conditions: Unique geological features, such as greenstone belts, provide invaluable information about early habitable conditions and the emergence of life.
    • Global Geodynamic Processes: Comparative studies across cratons worldwide facilitate the construction of comprehensive models elucidating ancient geodynamic processes prevalent during the Archaean.

  • What is Humboldt’s Enigma and What does it mean for India?

    Humboldt’s Enigma

    Introduction

    • The question of where biodiversity is concentrated has intrigued explorers and naturalists for centuries. Humboldt has tried to answer this question.

    Humboldt’s Insights

    • Alexander von Humboldt: A polymath of the 18th century, Humboldt recorded diverse natural observations, proposing a relationship between temperature, altitude, humidity, and species distribution.
    • Mountain Exploration: During his exploration of South America, Humboldt studied plant distribution on mountains, noting variations with elevation.
    • Chimborazo Mountain: Humboldt used Chimborazo Mountain in Ecuador as an example, illustrating the concept of mountain diversity.

    What is Humboldt’s Enigma?

    • Sun’s Energy: Tropical areas receive more solar energy, fostering greater primary productivity and biodiversity due to the availability of ecological niches.
    • Mountain Exception: Mountains, despite being outside the tropics, have been an exception to the rule, posing Humboldt’s enigma.

    Biodiversity Drivers

    • Earth’s History, Geography, and Climate: These factors are the primary drivers of mountain diversity.
    • Geological Processes: Mountains serve as ‘cradles’ for new species due to geological processes like uplifts, creating new habitats.
    • Climatic Stability: Climatologically stable mountains act as ‘museums,’ preserving species over time.
    • Coastal Tropical Sky Islands: Examples like the Shola Sky Islands in the Western Ghats exhibit both cradle and museum characteristics.

    Eastern Himalaya: An Anomaly

    • Diversity Beyond Tropics: Eastern Himalaya boasts exceptional diversity, challenging the conventional tropical biodiversity paradigm.
    • Multiple Factors: Climate dissimilarity and geological heterogeneity contribute to high biodiversity.
    • Climate Variability: Different temperature and rainfall levels on the same mountain support diverse biomes.

    Unresolved Questions

    • Complexity of Biodiversity: Numerous factors drive diversification and Humboldt’s enigma in different regions, leading to over a hundred hypotheses.
    • Data Limitations: Fine-scale species occurrence data are lacking, hindering precise explanations.
    • Call for Research: India’s under-studied areas need more extensive research, including the use of genetics, to understand true biodiversity.
    • National Initiatives: Programs like the National Mission on Himalayan Studies and Biodiversity need strengthening to support basic research.

    Conclusion

    • Humboldt’s enigma represents one facet of mountain biodiversity, offering opportunities for study and insights into global climate and landscape change issues.

  • How Lakshadweep’s Unique Cultural Landscape developed?

    Lakshadweep

    Introduction

    • PM’s recent trip to Lakshadweep has brought the islands into the national conversation.

    About Lakshadweep

    Details
    Location In the Arabian Sea, off the southwestern coast of India.
    Geographical Formation Formed by coral activities and have a coral atoll structure.
    Formation as UT Formed as a Union Territory of India in 1956.
    Total Islands Comprises 36 islands, including atolls, coral reefs, and submerged banks.
    Inhibition 10 of the 36 islands are inhabited.
    Capital Kavaratti is the capital of the Union Territory.
    Area Total area of 32 sq km.

    Cultural Uniqueness of Lakshadweep

    • Diverse Influences: The islands exhibit a unique blend of cultural influences from Malayalis, Arabs, Tamils, and Kannadigas.
    • Distinct Islamic Practice: The form of Islam practiced here is distinct from the rest of India, reflecting the islands’ diverse ethnic and linguistic heritage.

    Historical Roots: A Pre-Islamic Hindu Society

    • Early Settlers: Scholar Andrew W Forbes suggests that the first settlers were likely Malabari sailors, possibly castaways.
    • Hindu Influence: Evidence points to a pre-Islamic Hindu society, with remnants like buried idols and traditional songs hinting at past Hindu practices.

    Conversion to Islam: A Gradual Transition

    • Arab Influence: Regular contact with Arab merchants and sailors led to the gradual conversion of islanders to Islam, distinct from the Islamic practices in mainland India.
    • Peaceful Introduction of Islam: Historian Mahmood Kooria notes that Islam’s introduction in the region, including Lakshadweep, was marked by minimal political conflict, primarily through commercial interactions.

    Cultural Development: Insulation from Mainland Influences

    • Control by the Arakkal Kingdom: In the 16th century, the islands fell under the Arakkal kingdom of Kannur, Kerala’s only Muslim dynasty.
    • European Interactions: Despite conflicts with European powers, the islands maintained a degree of protection and isolation.
    • British Era: The British rule further insulated Lakshadweep, allowing its culture to evolve distinctly from mainland India.
    • Linguistic Diversity: The islands’ isolation is reflected in their linguistic diversity, with Malayalam, Jazari, and Mahl being the main languages.

    Matrilineal Society: A Unique Aspect of Lakshadweep’s Islam

    • Matriliny in Islamic Society: Lakshadweep’s Islamic society is characterized by matriliny, tracing descent and property through the mother’s line.
    • Anthropological Perspectives: Anthropologist Leela Dube highlights the compatibility of matriliny with Islam in Lakshadweep, contrary to conventional Islamic practices.
    • Kerala’s Influence: Historian Manu Pillai links the matrilineal tradition to Kerala’s cultural patterns, where Nairs and Namboodiris practised matriliny.
    • Broader Indian Ocean Context: Kooria points out that matriliny is common among Muslims in the Indian Ocean region, suggesting a broader cultural context.

    Religious and Sociological Interpretations

    • Islamic Justification for Matriliny: Islanders believe their matrilineal practice aligns with Islam, citing Prophet Muhammad’s life with his first wife, Khadija.
    • Sociological Viewpoint: Dr. N P Hafiz Mohamad emphasizes that the islanders see matriliny as integral to their Islamic practice.

    Conclusion

    • Preservation of Unique Traditions: Lakshadweep’s relative isolation has helped preserve its unique cultural and religious practices.
    • Integration of Diverse Influences: The islands represent a remarkable integration of various cultural and religious influences, forming a distinct identity within the Indian subcontinent.
    • Significance in Broader Indian Ocean Culture: Lakshadweep’s cultural practices, particularly its matrilineal society, highlight the interconnectedness and diversity of cultures across the Indian Ocean region.

  • Earthquake and Tsunami strikes Central Japan

    japan

    Central Idea

    • On January 1, 2024, a 7.5-magnitude earthquake hit Ishikawa prefecture in Japan, triggering tsunami waves over a meter high.

    Japan’s Geographical Vulnerability

    • Japan’s geographical vulnerability, particularly concerning plate tectonics, is a critical aspect of its environmental and disaster management challenges.
    • The country’s location at the convergence of several major tectonic plates makes it highly susceptible to seismic activities.

    Here’s a detailed look at how plate tectonics contribute to Japan’s geographical vulnerability:

    [1] Convergent Plate Boundaries:

    • Pacific Ring of Fire: Japan is located on the Pacific Ring of Fire, an area with a high level of seismic activity due to the presence of numerous tectonic plate boundaries.
    • Plates Involved: The primary tectonic plates interacting near Japan are the Pacific Plate, the Philippine Sea Plate, the Eurasian Plate, and the North American Plate.
    • Subduction Zones: The Pacific and Philippine Sea plates are subducting beneath the Eurasian and North American plates. This subduction process is a significant source of seismic activity, including powerful earthquakes and volcanic eruptions.

    [2] Earthquake Activity:

    • Frequent Earthquakes: The movement of these plates results in frequent earthquakes. Japan experiences thousands of tremors annually, ranging from minor to catastrophic.
    • Major Earthquakes: Historical events like the 2011 Great East Japan Earthquake and the 1995 Great Hanshin Earthquake demonstrate the potential for massive destruction and loss of life due to Japan’s tectonic setting.

    [3] Tsunami Risk:

    • Generation of Tsunamis: Earthquakes occurring under the sea or along the coast can displace large volumes of water, leading to tsunamis. The 2011 tsunami, triggered by a massive undersea earthquake, caused widespread devastation and the Fukushima nuclear disaster.
    • Coastal Impact: Japan’s extensive coastline makes it particularly vulnerable to tsunamis, which can arrive within minutes of an undersea earthquake, leaving little time for evacuation.

    [4] Volcanic Activity:

    • Volcanic Eruptions: The subduction of the Pacific and Philippine Sea plates not only causes earthquakes but also contributes to significant volcanic activity. Magma generated by the melting of the subducted plate rises to the surface, leading to volcanic eruptions.
    • Active Volcanoes: Japan has over 100 active volcanoes, a direct result of its tectonic setting. Eruptions pose risks to nearby populations and can disrupt air travel and local economies.

    [5] Geological Complexity:

    • Intersecting Faults: The interaction of multiple tectonic plates creates a complex network of faults, increasing the unpredictability and variability of seismic events.
    • Diverse Seismic Phenomena: This complexity leads to a range of seismic phenomena, including deep-focus earthquakes, which occur at greater depths and can affect broader areas.

  • What are Polar Stratospheric Clouds (PSCs)?

    Polar Stratospheric Clouds (PSCs)

    Central Idea

    • Residents in the Arctic have witnessed an extraordinary atmospheric display of Polar Stratospheric Clouds (PSCs).

    Polar Stratospheric Clouds (PSCs)

    Details
    Formation and Location Form in the polar stratosphere at altitudes of 15,000–25,000 meters; common over Antarctica and the Arctic.
    Temperature Conditions Require extremely cold temperatures, typically below −78°C (−108°F).
    Types Type I: Composed of water and nitric acid.

    Type II: Made almost entirely of water ice.
    Role in Ozone Depletion Facilitate chemical reactions that produce chlorine and bromine compounds, leading to ozone destruction.
    Appearance Iridescent, shimmering pastel colors, leading to their nickname “nacreous” or “mother-of-pearl” clouds.
    Observation Visible during twilight, illuminated from below by the Sun.
    Research and Monitoring Studied for impact on ozone depletion and climate change; monitored via satellites and ground stations.
    Environmental Concern Linked to human-made chemicals like CFCs; subject to international regulation like the Montreal Protocol.
    Climate Change Connection Research ongoing into how climate change might affect PSCs’ frequency and distribution.
    Discovery and Study History Observed since the 19th century; their role in ozone depletion understood in the 1980s.

  • Volcanic Eruption in Iceland

    Iceland

    Central Idea

    • A volcanic eruption occurred near Iceland’s capital between Sýlingarfell and Hagafell, near the town of Grindavik on the Reykjanes Peninsula.

    Iceland: ‘Land of Fire and Ice’

    • Geographical Location: Iceland is situated just south of the Arctic Circle in the North Atlantic Ocean.
    • Tectonic Setting: The country lies on the Mid-Atlantic Ridge, marking the boundary between the North American and Eurasian tectonic plates.
    • Unique Landscape: Iceland’s landscape features geysers, glaciers, mountains, volcanoes, and lava fields, housing 33 active volcanoes – the highest number in Europe.
    • Historical Settlement: The first human settlement in Iceland dates back to 874 by Norsemen from Scandinavia, leading to the founding of Reykjavik.

    Recent Volcanic Activity on the Reykjanes Peninsula

    • Historical Dormancy: The Reykjanes Peninsula had not experienced volcanic eruptions for 800 years until recently.
    • Recent Eruptions: The current eruption is the fourth in less than three years on the peninsula, indicating a potential new era of volcanic activity.
    • Eyjafjallajokull Eruption: The last major volcanic event in Iceland that gained global attention was the 2010 eruption of Eyjafjallajokull.
    • Eruption Timeline and Impact: The volcano erupted twice in March and April 2010, spreading an ash cloud across continents and disrupting air traffic on the North Atlantic route for six days – the longest disruption since World War II.

  • Places in news: Mount Merapi

    volcano

    Central Idea

    • Mount Merapi in Indonesia has erupted yet again this year, spewing an ash tower 3,000 metres into the sky.

     

    Merapi Volcano: A Brief Overview

    • Location: Situated in Central Java, Indonesia, Merapi is aptly named “Mountain of Fire” in Javanese.
    • Activity: It ranks among the world’s most active and perilous volcanoes, known for frequent and often violent eruptions.
    • 2010 Eruption: The last significant eruption in 2010 led to over 350 fatalities and extensive damage to surrounding areas.
    • Tourist Attraction: Despite its dangers, Merapi attracts hikers and tourists drawn to its beauty and geological significance.

    Other active volcanoes in Indonesia

    volcano

    Indonesia is home to many active volcanoes, with over 120 active volcanoes located across the country. Some of the other major volcanoes in Indonesia include:

    • Mount Krakatoa: Located in the Sunda Strait, it’s notorious for the catastrophic 1883 eruption.
    • Mount Rinjani: On Lombok Island, it’s Indonesia’s second-highest volcano and a trekking hotspot.
    • Mount Tambora: Famous for the 1815 eruption, it caused the “year without summer” and is situated on Sumbawa Island.
    • Mount Batur: In Bali, known for scenic vistas and hot springs.
    • Mount Merbabu: The highest in Central Java, it’s a favored destination for climbers.

    Why so many volcanoes in Indonesia?

    • Pacific Ring of Fire: Indonesia’s location on this seismic hotspot explains its high volcanic activity.
    • Volcanic Density: With over 120 active volcanoes, Indonesia faces frequent eruptions, posing risks to its population and infrastructure.

    Back2Basics: Pacific Ring of Fire

    • Geographical Span: This 40,000 km horseshoe-shaped belt around the Pacific Ocean is a seismic hub.
    • Volcanic and Seismic Activity: Home to 75% of the world’s active volcanoes and 90% of earthquakes.
    • Tectonic Movements: The Pacific Plate’s collision with smaller plates leads to subduction, causing friction and pressure.
    • Resulting Phenomena: This tectonic activity results in frequent volcanic eruptions and earthquakes.
    • Countries Included: The Ring of Fire affects several regions, including Japan, Indonesia, the Philippines, Papua New Guinea, New Zealand, and the Americas’ west coasts.
    • Natural Resources: The region is rich in geothermal energy and minerals.

  • Cyclone Michaung makes landfall

    Central Idea

    • Cyclone Michaung (name suggested by Myanmar) makes landfall in Tamil Nadu and Andhra Pradesh.
    • Michaung is the fourth tropical cyclone over the Bay of Bengal this year.

    About Cyclone Michaung

    • Uncommon Intensity: December cyclones in the North Indian Ocean typically do not reach high intensities. Michaung, with its severe storm classification, is an exception.
    • Upgraded Intensity: Initially predicted as a tropical cyclone, IMD upgraded Michaung to a ‘severe’ storm due to its unexpected intensification.
    • Heat Index Contribution: The intensification is attributed to the above-normal heat index values off the southern Andhra Pradesh coast.

    Indian Tropical Storms: An Overview

    • Annual Cyclones: The North Indian Ocean basin averages about five cyclones per year, predominantly in the Bay of Bengal.
    • Arabian Sea Cyclones: Though less frequent, Arabian Sea cyclones often reach higher intensities and can cause extensive damage.
    • Peak Cyclone Seasons: Cyclones are most common during pre-monsoon (April-June) and post-monsoon (October-December) months, with May and November seeing more intense storms.

    Factors Influencing Storm Intensification

    • Ocean Heat: Cyclones draw energy from warm ocean temperatures, typically around 26 degrees Celsius or higher.
    • Tropical Cyclone Heat Potential (TCHP): This oceanographic parameter is crucial in cyclone genesis and intensification.
    • Complex Atmospheric Conditions: Various atmospheric factors like wind shear, convection, and air-sea interactions also play a role in cyclone development.
    • Coriolis Effect: This effect influences cyclone formation in the northern hemisphere, causing air to move anticlockwise in low-pressure areas.

    Back2Basics: Extratropical and Tropical Cyclones

    • General Definition: Cyclones are large-scale air systems rotating around a low-pressure center, often accompanied by violent storms.
    • Extratropical Cyclones: Found outside the tropics, these cyclones have a cold core and gain energy from interactions between cold and warm air masses. They can form over both land and sea.
    • Tropical Cyclones: These form in tropical regions and are powered by the condensation of water vapor. They lack associated warm or cold fronts and are known as hurricanes or typhoons in different regions.

    Cyclone Naming Process

    • Rotational Basis for Naming: The naming of cyclones is done by countries on a rotational basis, following certain existing guidelines.
    • Responsibilities of RSMCs and TCWCs: Worldwide, there are six regional specialized meteorological centers (RSMCs) and five regional Tropical Cyclone Warning Centers (TCWCs) mandated for issuing advisories and naming of tropical cyclones.
    • IMD’s Role: IMD is one of the six RSMCs providing tropical cyclone and storm surge advisories to 13 member countries under the WMO/Economic and Social Commission for Asia-Pacific (ESCAP) Panel.
    • Naming Authority of IMD: RSMC, New Delhi, is also mandated to name the tropical cyclones developing over the north Indian Ocean, including the Bay of Bengal and the Arabian Sea.
    • Guidelines for Naming: Some rules are to be followed while naming cyclones, such as being neutral to politics, religious beliefs, cultures, and gender, avoiding offensive or cruel names, and keeping the name short and easy to pronounce.
    • Future Naming: After ‘Michaung’, the next cyclone as per India’s suggestion will be named ‘Tej’.

  • Southern Annular Mode (SAM) and Indian Ocean Weather Conditions

    Southern Annular Mode

    Central Idea

    • The Indian National Centre for Ocean Information Services (INCOIS), a division under the Ministry of Earth Sciences (MoES), has made a significant discovery regarding the Southern Annular Mode (SAM), a crucial climate pattern.
    • Their research has revealed that SAM plays a pivotal role in influencing sea conditions across the Indian Ocean.

    What is Southern Annular Mode (SAM)?

    Description
    Idea behind
    • Mode of atmospheric variability representing north-south movement of the westerly wind belt around Antarctica.
    • Also known as Antarctic Oscillation (AAO).
    Phases
    1. Positive Phase: Wind belt contracts towards Antarctica.
    2. Negative Phase: Wind belt expands towards the equator.
    Impact on Weather Patterns
    • Influences temperature, rainfall, and storm intensity in the Southern Hemisphere.
    • Causes difference in the zonal mean sea level pressure at 40°S (mid-latitudes) and 65°S (Antarctica).
    Influence on Indian Ocean Affects ocean currents and sea surface temperatures, impacting regional weather and marine life.
    Climate Change Connection Trend towards more positive phases in recent decades, influenced by human-induced climate change.
    Effect on Antarctic Ice Impacts Antarctic ice sheets and sea ice extent through changes in wind patterns.
    Global Climate Interaction Interacts with other climate phenomena like ENSO.
    Predictability and Variability Exhibits seasonal predictability and interannual variability, important for long-term forecasting.
    Marine Ecosystems Affects marine ecosystems in the Southern Ocean, influencing productivity and species distribution.

    Role of Ocean Surface Waves

    • Coastal Processes: Ocean surface waves are key players in shaping coastal processes, impacting shoreline erosion, sediment transport, coastal engineering, and recreational activities.
    • Scientific Approach: The scientific team leveraged 40 years of data (1979 to 2018) from the European Centre for Medium-Range Weather Forecast.

    Positive and Negative SAM Phases

    • Positive SAM Phase: During a positive SAM phase, a cyclic pattern of warm sea surface temperature anomalies emerges, accompanied by strong winds that increase wave activity in the Indian Ocean. A new swell generation region along the east African coast contributes to heightened wave heights in the Arabian Sea.
    • Negative SAM Phase: Conversely, during a negative SAM phase, the eastern tropical southern Indian Ocean becomes the primary region for generating swells, resulting in reduced wave heights in the Arabian Sea.

    Significance of SAM

    • Coastal Planning: Understanding SAM allows for better coastal planning, helping coastal communities prepare for the impact of changing sea conditions.
    • Resource Management: SAM insights can aid in more efficient resource management, optimizing the utilization of marine resources.
    • Disaster Preparedness: Knowledge of SAM patterns can enhance disaster preparedness efforts, enabling timely response to potential ocean-related disasters.
    • Wave Predictions: The research contributes to improving wave predictions, offering advanced forecasting capabilities.
    • Benefiting Stakeholders: Stakeholders in the blue economy, including shipping, maritime boards, and the oil industry, can optimize their multi-million-dollar operations at sea based on SAM insights.

    Implications for Various Sectors

    • Monsoon Season Impact: Typically, inland vessel operations and oil exploration activities face restrictions during the monsoon season.
    • Fair Sea State Windows: Predicting SAM phases through the Ocean Forecasting System can identify “Fair Sea state windows” during monsoons.
    • Impact on Blue Economy: These fair windows can be leveraged by oil and shipping industries, making a significant contribution to blue economy activities along the Indian coast

  • Mount Etna in Italy erupts

    etna

    Central Idea

    • Volcanic eruptions often make headlines only when iconic volcanoes like Etna, Kilauea, or Eyjafjallajokull erupt.
    • However, throughout any given year, our planet witnessed numerous volcanic eruptions, with as many as 50 to 80 occurring worldwide.

    About Mount Etna

    • Mount Etna, located in Italy, holds the title of Europe’s most active volcano and ranks among the world’s largest.
    • Its recorded volcanic activity dates back to 1500 B.C., with over 200 eruptions documented since then.
    • Etna’s recent eruptions have disrupted air travel, leading to flight cancellations at the nearby Catania airport.
    • Additionally, the accumulation of volcanic ash on roads prompted authorities to temporarily ban the use of cars and motorbikes due to safety concerns.

    Volcanic Eruptions this Year

    Many of the world’s most active volcanoes are concentrated in the Pacific Ring of Fire, encompassing regions like New Zealand, Southeast Asia, Japan, and the western coast of the Americas. This volatile area also experiences about 90% of all earthquakes globally.

    • Kilauea, Hawaii: The Kilauea volcano in Hawaii captivated the world with a nearly nonstop eruption that began in 1983 and continued for an astonishing 35 years until 2018. Remarkably, it rekindled in 2021, with the eruption still ongoing.
    • Dukono, Indonesia: Erupting since August 1933, Dukono volcano in Indonesia stands as a testament to long-term volcanic activity, defying the passage of time.
    • Santa Maria, Guatemala: The eruption of Santa Maria in Guatemala commenced in June 1922 and persists to this day, underscoring the enduring nature of certain volcanic phenomena.
    • Yasur, Vanuatu: Yasur in Vanuatu first erupted around 1270 and has maintained its volcanic activity, continuing as of June 9, 2023.

    Understanding Volcanoes

    • Volcanoes are geological features characterized by openings or vents through which lava, tephra (small rocks), and steam erupt onto the Earth’s surface.
    • They result from both their own eruptions and the broader processes of tectonic plate movement.
    • Volcanic eruptions are essentially the result of magma, or molten rock, beneath the Earth’s surface rising, bubbling, and ultimately overflowing, much like boiling milk spilling out of a pot on a stove.
    • The magma seeks pathways to vents within the volcano, where it erupts and is expelled across the land and into the atmosphere, a phenomenon referred to as lava.

    Types of Volcanoes

    Appearance Formation Eruption Style Notable Examples
    Cinder Cones Small, steep, conical Formed from basaltic magma with high gas content Often explosive eruptions with cinders/scoria Paricutin (Mexico), Sunset Crater (USA)
    Composite/Stratovolcanoes Tall and symmetrical Result from alternating layers of lava, ash, etc. Both explosive and effusive eruptions Mount St. Helens (USA), Mount Fuji (Japan)
    Shield Volcanoes Broad and gently sloping Primarily formed from basaltic magma Primarily non-explosive with extensive lava flows Mauna Loa, Mauna Kea (Hawaii)
    Lava Domes Rounded dome-like shape Formed from slow extrusion of viscous magma Typically non-explosive but can be dangerous Novarupta Dome (Alaska), Mount St. Helens’ Lava Dome (USA)